Texas Instruments ADS8513IDWR

Overview

ADS8513IDWR from Texas Instruments is a 16-bit, 40kSPS successive approximation register (SAR) analog-to-digital converter with internal 2.5V reference, ±10V input range capability, and SPI-compatible serial/parallel interface. It operates from a single 5V supply, delivers 89dB SNR at 10kHz, ±2LSB max INL, and 24mW typical power dissipation - deployed in industrial process control and portable data acquisition systems requiring high DC accuracy and low power.

For engineers reviewing the ADS8513IDWR datasheet, ADS8513IDWR pinout, ADS8513IDWR application, or ADS8513IDWR equivalent, key selection criteria include its 16-bit NMC performance, ±25V input overvoltage tolerance, dual-mode DATACLK (internal/external), 3-stated bus for multi-chip S/H synchronization, and SO-16 package compatibility with ADS7813/ADS8512.

Technical Context

The ADS8513IDWR integrates a capacitor-based SAR core with integrated sample-and-hold, internal reference buffer (BUF), and configurable analog input network (R1IN/R2IN/R3IN) supporting seven voltage ranges including ±10V, ±5V, 0–10V, and 0.5–4.5V. Its conversion timing is fixed at 25µs per cycle, enabling deterministic 40kSPS throughput independent of external clock jitter when using internal DATACLK.

Digital interface operation supports master/slave SPI mode up to 20MHz; DATA output is synchronized to DATACLK edges (both rising/falling when internal clock enabled), while BUSY provides frame-sync signaling. The CONV input initiates acquisition and conversion independently of CS state, and PWRD enables 50µW power-down mode with 300µs recovery to full accuracy.

Key Specifications

Pinout & Package

ADS8513IDWR is housed in a 16-pin SOIC (SO-16, DW package) with standard 1.27mm pitch and gull-wing leads. Thermal resistance θ_JA = 46°C/W enables stable operation at full throughput in industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8513IDWR, ADS8512IDWR trades 4 bits of resolution and 11dB SNR for lower cost and power, while ADS7813UB sacrifices integration (no internal ref/buffer) and robustness (±15V max) for design flexibility - making ADS8513IDWR optimal for new 16-bit industrial DAQ where accuracy, ease-of-use, and fault tolerance are prioritized.

Availability

ADS8513IDWR is available at Aetrix Electronics and suitable for industrial process control, test equipment, robotics, and medical instrumentation requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.

Supply support for ADS8513IDWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with decades of precision data converter innovation.

The ADS8513 product line delivers high-resolution, low-power SAR ADCs optimized for industrial, medical, and test equipment applications demanding DC accuracy, wide input range flexibility, and robust operation in electrically noisy environments.

FAQ

What input voltage ranges does the ADS8513IDWR support?

The ADS8513IDWR supports seven configurable analog input ranges via R1IN/R2IN/R3IN connections: ±10V, ±5V, 0–10V, 0–4V, ±3.33V, 0.5–4.5V, and high-impedance 0.3–2.8V. Each range is selected by specific pin wiring per Table 1 in the datasheet; no external components are needed to configure these ranges. The ADS8513IDWR tolerates ±25V on all analog inputs without damage, enhancing field reliability.

Does the ADS8513IDWR require an external reference voltage?

No, the ADS8513IDWR includes an internal 2.5V reference with ±0.1% initial accuracy and 8ppm/°C drift, eliminating the need for external references in most applications. The REF pin can optionally accept an external 2.3–2.7V reference to override the internal source, but this is not required. Internal reference operation uses the BUF and CAP pins for buffering and compensation, as specified in the ADS8513IDWR datasheet.

How does the ADS8513IDWR handle power-down mode?

The ADS8513IDWR enters ultra-low-power mode (50µW typical) when the PWRD pin is driven high. Recovery to full accuracy takes ≤300µs after PWRD returns low, measured from power-down exit to valid conversion result. Unlike earlier TI SAR ADCs, ADS8513IDWR does not require CONV to be low before asserting PWRD - simplifying power sequencing. All analog and digital functions resume fully upon wake-up with no recalibration needed.

Is the ADS8513IDWR pin-compatible with other TI ADCs?

Yes, the ADS8513IDWR is pin-compatible with the 16-bit ADS7813 and 12-bit ADS7812/ADS8512 in the SO-16 (DW) package. This allows direct substitution to increase resolution or maintain footprint during design revisions. However, ADS8513IDWR adds features absent in those predecessors - including internal reference, BUF/CAP compensation nodes, and enhanced overvoltage tolerance - so full functional equivalence requires verifying interface and timing compatibility per application.

What serial interface protocol does the ADS8513IDWR use?

The ADS8513IDWR implements an SPI-compatible serial interface with binary two's complement output format, MSB-first transmission, and programmable clock source (internal or external DATACLK). It supports master/slave operation up to 20MHz and provides 3-stated DATA, BUSY, and DATACLK outputs controlled by CS. The interface requires no external framing signals - BUSY serves as natural frame sync - and supports simultaneous multi-chip sampling via global CONV triggering.